Finding the Fourth Proportional to 1,061.28, 1,593.12 and 485.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.28 : 1,593.12 = 485.34 : x
2. Step 2: Convert to fraction form
   1,061.28/1,593.12 = 485.34/x
3. Step 3: Cross multiply
   1,061.28x = 1,593.12 × 485.34
4. Step 4: Simplify right side
   1,061.28x = 773,204.86
5. Step 5: Solve for x
   x = 773,204.86/1,061.28
6. Step 6: Final answer
   x = 728.56